Transformer core-structure



June 24, 1930.

| L. COLE TRANSFORMER CORE STRUCTURE Filed March 12, 1929 Fig. 2.

Fig. 4.

Fig. .7.

LIIIHPIVIIIHINIHHHIII L INVENTOR Home@ L. Cole.

Patented June 24, 1930 i UNIT-ED STATES PATENT- oFFlcE i HORACE L.v COLE, OF SHARON, PENNSYLVANIA, ASSIGNOR 'IO WESTINGHOUSE ELEC- TRIO & MANUFACTURING COMPANY, A CORPORATON OF PENNSYLVANIA TRANSFOR-MER CORE-STRUCTURE Application filed March 12, 1929. Serial No. 346,394.

My invention relates to single-phase transformers, and more particularly to the construction of the coreand the arrangement o'f 'the coils thereon.

c yIt isc'ommon practice to mount the coils 2@ the single-axis construction, the unit stresses are much higher per stack during a short circuit of the transformer than when a multiple-axis arrangement of the windings is employed, thus necessitating a more compli- 2 5 cated systemof bracingto withstand these stresses. By-my proposed arrangement of ythe core and windings of a transformer, the amount of iron required for the magnetic circuitfis reduced and the core` ventilation is improved.

An object of invention is to provide a single-phase transformer that will be compact and economical of materials used.

Another objectof'my invention is to provide a single-phase transformer in which the metal' required forV the core structure is materially reduced.

Affurther-object of my invention is to provide a single-phase transformer having a 4o plurality of cooperating primary and secondary windings that are magnetically linked by one or more sections of a core structure.

Other objects will appear from the accompanying disclosure and claims.

A better understanding of vmy invention will be obtained by reference to the accompanying drawings and the following detailed description z Figure l is an elevational view, and

Fig. 2 is a plan view of a single-phase transformer having rectangular coils and embodying my invention. y l

Fig. 3 is an elevational View, and

Fig. 4: is a plan view of a single-phase transformer having circular coils, and embodying my invention, and,

Fig. 5 is a diagrammatic view of core members and coils of a transformer embodying my invention.

In the illustrated embodiment of my invention, l provide a single-phase transformer, its core structure comprising three single core units l, 2, l said units being placed contiguously and extending in substantially the same plane, with spaces 5 left between them for ventilation. In other embodiments of my invention, vthe number of core units may be increased. Also, the disposition of the coils, with respect to each other, may be changed. I provide stacks yof windings, each stach comprising cooperating primary and secondary windings interlinling adjacent legs of adjoining sections. While the figures shown illustrate the improved core structure with the well known interleaved windings, the invention is not limited to the employment of such windings, but may be employed with a winding of any other type commonly embodied in transformers, such, for example, as concentric windings.

The two endI core units are of sufficient size to accommodate the interlinking of one leg of each core section with one leg of the intermediate core section by the cooperating primary and secondary windings. This necessitates the intermediate units being approximately twice as wide as the end units.

Referring particularly to Figs. 2, 3 and 5, the units 1 and 2 are illustrated as being of substantially rectangular shape, although any desired shape may be employed, each unit having a rectangular aperture,one dimension of unit 1 being` substantially one-half that of the corresponding dimension of unit 2, the other dimensions being the same for all units. The units l and 2 maybe formed of anyv suitable magnetic material, and each unit may be formed, or built up, from suitable punchings, as desired.

Suitable windings 3 and 4l are mounted upon the units 1 and 2 in such manner, that the adjacent edges of two of the units comprise the core member for the primary and secondary windings. The primary and secondary windings may be respectively connected `parallel-.circuit relation or in series-circuit relation. By s o the units 1 and 2, that small spaces 5 are left between them, sufficient ventilation of each cone is obtained. Y.

It will be observed that the core member for the windings 3 and 4 comprises a side wall of an intermediate unit and the adjacent wall of an end unit. One intermediate core unit and its magnetic circuit are common to two stacks vof cooperating primary an secondary windings. The magnetic flux set up about the side walls of theintermediate core unit cuts both stacksof windings. By placing two of these core units contiguously to obtain the satisfactory amount of metal forthe core for each set of windings, a considerable saving of material ise'ected over that requiredfor two or more complete magnetic circuits for each stack of windings.

It will Vbeseentluit `the core units may be multiplied '.indeiinitely, and the capacities increased to vany value desired, the only limitation being that of available space or shipping limitations.

It will be evident that I have provided an im a oved corestructure for single-phase trans ormers inwhich there is a material reduction in thepmetal required,.and in which its capacit is greatly increased without increasing t e height or width yof the transformer. The ventilation of .the core is improved, the bracing of the Vcoils requires a more simple mechanical structure, and the amount of material in themagnetic core is lessthan for the usual construction.

Since various changes` and modifications may be made in the arrangement and assembly ofthe several features of my invention without departing from the scope and a spirit thereof, it is .to be understood that no limitations are to be imposed except as expressed in the appended claims.

I claim as my invention:

1. In a single-phase transformer, a core structure consisting of at least three apertured units, said units being placed end to end and insubstantially the same plane, two of units being end units having one of the dimensions of the intermediate units and substantially neehalf of another dimension ofthe intermediate units, said unitshaving theirapertures in parallel relation.

2. Ina single-phase transformer, ay plurality of windings, a core structure,sa1,d core structure consisting of at least three apertured core units,the saidcore units bein of substantially rectangular shape, exten g in substantiall the same plane and contignous, tivo of t e units being .end units,..th

said end units and their a rtures having' one of the dimensions of t e intermediate y core unit and its aperture, and substantially one-half the other dimension, said units having1 their aperres indparallel relation, said co1 sm so4 'spose ecoretructure as t0 link the daning .aids ef twodnt core units.

i 3. In a single-phase transformer, a corer structure. comprising a. plurality oflmtiu each forming a closedtie circuit, a plurality Aof .stecks of cooperating prima and secondary windings, the winding of e stack linking ltwo umts of the core. v

v4. In`4 {single-phase transformer, a. corea. structure comprisin a plurality of each forming a close magnetic` circuit, me rality of stacks of cooperating primar and secondar windings, the windings oY stack lin ing two units of the core, andthe'v g5 windings of the several stacks being intel"N linked through common units` 0f the mag-" netic circuit. i 'i 'f' 5. In a single-phase transformer, a core'" structure comprising a plurality of each forming a closed magnetic circuit, l" plurality of stacks of cooperating and seconda windings, the wln' each stack lin ng two units 'of the core, a at least one of the uniteof the CQI'Q IM L linking a plurality' of stacks of coils..

6. In a single-phase transformer, a structure comprising a plurality of unita:A forming closed magnetic circuits, a plural.-

ity of stacks of windings linking ditfereatilo portions of said magnetic circuits, each'gtaek i comprising cooperating primary andseconde,- V4 ar windings.

In a single-phase transformar, a structure comprising a plurality of im each forming a closed magnetic.,circnitwai plurality Vof Astacks of, f rating rimazy-:aand secondar windings 'fmt-v portions of said core structure, the;magnett-.)`

circuit of at least one core'unit .that 2,)0 windings of a plurality ofLstacks,an the@ magnetic circuits of a plunalityf ,said linkling single stacks 0f `1 tive y. fr In testimony whereof; Inbev@ -hereuntof 1.1! subscribed my name thisrhh day of Ml'll.,

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